make tags more precise, add Fixnum#~

spec/tags/core/fixnum/bit_and_tags.txt

@@ -1 +1,3 @@
-fails:Fixnum#&
+fails:Fixnum#& returns self bitwise AND other
+fails:Fixnum#& returns self bitwise AND a Bignum
+fails:Fixnum#& raises a TypeError when passed a Float

spec/tags/core/fixnum/bit_or_tags.txt

@@ -1 +1,2 @@
-fails:Fixnum#|
+fails:Fixnum#| returns self bitwise OR other
+fails:Fixnum#| raises a TypeError when passed a Float

spec/tags/core/fixnum/bit_xor_tags.txt

@@ -1 +1,3 @@
-fails:Fixnum#^
+fails:Fixnum#^ returns self bitwise EXCLUSIVE OR other
+fails:Fixnum#^ returns self bitwise EXCLUSIVE OR a Bignum
+fails:Fixnum#^ raises a TypeError when passed a Float

topaz/objects/intobject.py

@@ -153,10 +153,8 @@ def method_pow(self, space, w_other):
                 [w_other]
             )
         else:
-            raise space.error(
-                space.w_TypeError,
-                "%s can't be coerced into Fixnum" %
-                    space.obj_to_s(space.getclass(w_other))
+            raise space.error(space.w_TypeError,
+                "%s can't be coerced into Fixnum" % space.obj_to_s(space.getclass(w_other))
             )
 
     def method_pow_int_impl(self, space, w_other):
@@ -217,6 +215,10 @@ def method_xor(self, space, other):
     def method_or(self, space, other):
         return space.newint(self.intvalue | other)
 
+    @classdef.method("~")
+    def method_invert(self, space):
+        return space.newint(~self.intvalue)
+
     @classdef.method("==")
     def method_eq(self, space, w_other):
         if isinstance(w_other, W_FixnumObject):